沖縄幼児における乳歯列弓の形態学的研究
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概要
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Many investigators indicated that there are differences of race and area on human traits. For the present paper, comparative and morphological investigation of the deciduous dentition were made on the plastercasts from 143 Okinawa children (82 boys and 61 girls) ranging in age from 3-5 years Kitakyushu children in same age group. The results were as follows : 1. Percentage of normal occlusion of deciduous dentition in Okinawa children was showed 65% or more in both boys and girls, and it tended higher with an increase in age. In malocclusion, percentage of overbite totaly boys and girls was highest (11.9%), and percentage of edge to edge bite was higher but cross bite was lower in the girls than in the boys. 2. About type of interdental spaces, percentage of mixed type of primate space and developmental space was distinctly higher in the upper dental arch in both boys and girls. But, percentage of closed type as same level as mixed type of primate space and developmental space was higher in the lower dental arch, especially in the girls. 3. About type of terminal plane, percentage of bilateral vertical (straight) type was highest, 56.1% in the boys and 60.6% in the girls, then it was higher in order bilateral mesial step type, bilateral distal step type, vertical-mesial step type. No cases of vertical-distal step type and mesial-distal step type was observed. 4. Upper and lower dental arch lengths were not significantly different between boys and girls in OKinawa. It was recognized that lower anterior dental arch lengths were shorter, but upper anterior, upper posterior and lower posterior dental arch lengths were longer in the Okinawa than in the Kitakyushu children in both boys and girls. 5. Upper and lower dental arch breadths were significantly wider in the boys than in the girls. It was recognized that all the items, except lower posterior dental arch breadth in the girls, of Okinawa children showed wider levels than Kitakyushu children, especially upper and lower anterior dental arch breadths in the boys and upper anterior dental arch breadth in the girls. 6. All the dental arch indices were not significant difference between boys and girls in Okinawa. It was recognized that upper and lower anterior-posterior dental arch breadth indices were significantly higher in the Okinawa than in the Kitakyushu children in both boys and girls, but in the boys, lower anterior-posterior dental arch length index and lower anterior arch index were significantly lower in the Okinawa than in the Kitakyushu children.
- 九州歯科学会の論文
- 1986-12-25
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